Cyclins D1 and D3 and topoisomerase IIα in inactive pituitary adenomas
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The oncogenes cyclin D1 and D3 are overexpressed in many tumors. Topoisomerase IIα is found in proliferating cells. The immunohistological expression of cyclin D1, cyclin D3, and Topoisomerase IIα was studied in a collection of 60 clinically inactive surgically removed pituitary adenomas of the follicle-stimulating hormone/luteinizing hormone (FSH/LH) cell complex (20 null cell adenomas, 20 oncocytomas, and 20 FSH/LH cell adenomas) for correlation with other proliferation markers (Ki-67, PCNA) and with clinical data. Whereas cyclin D1 was positive only in one invasive null cell adenoma (1.7%) with some p53-positive nuclei, cyclin D3 was overexpressed in the nuclei of 41 tumors (68%).
Topoisomerase IIα was demonstrated in the nuclei of 42 adenomas (70%) with no significant differences discernible between the three adenoma subtypes. There was no significant correlation to the time of development of tumor symptoms, but a correlation of Topoisomerase IIα with cyclin D3 and the proliferation marker Ki-67 (Mib1). From these data we conclude that cyclin D3 and Toposomerase IIα appear to be additional markers for proliferation which can be used for prognosis index in surgical pathology of the pituitary.
Key wordsPituitary adenomas immunohistochemistry cyclins topoisomerase
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